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    • Measurement of the Bs0 Lifetime and Production Rate with Ds−ℓ+ Combinations in Z Decays

    Physics Letters B（1995）

    INST NATL PHYS NUCL & PHYS PARTICULES | Laboratoire de Physique des Particules (LAPP) | Institut de Fisica d'Altes Energies | Universidad Aut��noma de Barcelona(Universitat Aut��noma de Barcelona | Dipartimento di Fisica | Istituto Nazionale Di Fisica Nucleare | Institute of High-Energy Physics | European Laboratory for Particle Physics (CERN) | European Organization for Nuclear Research(CERN) | Laboratoire de Physique Corpusculaire | Universite Blaise Pascal(Universit�� Blaise Pascal) | Niels Bohr Institute | Nuclear Research Center Demokritos (NRCD) | Ecole Polytechnique(Ecole Polytechnique | Laboratoire de Physique Nucléaire et des Hautes Energies | Department of Physics | Supercomputer Computations Research Institute | Laboratori Nazionali dell'INFN (LNF-INFN) | Laboratori Nazionali di Frascati di INFN(Laboratori Nazionali di Frascati | Department of Physics and Astronomy | University of Glasgow(University of Glasgow) | Institut für Hochenergiephysik | Institut für Experimentalphysik | Institut für Physik | Centre de Physique des Particules | IN2P3 Institut National de Physique Nucleaire et de Physique des Particules(IN2P3-CNRS | Max-Planck-Institut für Physik | Max-Planck-Institut f��r Physik (Werner-Heisenberg-Institut)(Max-Planck-Institut f��r Physik) | Laboratoire de l'Accélérateur Linéaire | Dipartimento di Fisica dell'Università | Scuola Normale Superiore di Pisa(Scuola Normale Superiore) | Particle Physics Dept. | CEA | Institute for Particle Physics | Fachbereich Physik | Universit?t Siegen(Universit?t Siegen | Universit�� degli Studi di Trieste(University of Trieste | Experimental Elementary Particle Physics | University of Wisconsin Madison(University of Wisconsin-Madison)

    Cited 52|Views134
    Abstract
    The lifetime of the Bs0 meson is measured in approximately 3 million hadronic Z decays accumulated using the ALEPH detector at LEP from 1991 to 1994. Seven different Ds− decay modes were reconstructed and combined with an opposite sign lepton as evidence of semileptonic Bs0 decays. Two hundred and eight Ds−ℓ+ candidates satisfy selection criteria designed to ensure precise proper time reconstruction and yield a measured Bs0 lifetime of τ(Bs0) = 1.59−0.15+0.17 (stat) ±0.03 (syst) ps. Using a larger, less constrained sample of events, the product branching ratio is measured to be Br(b → Bs0) · Br(Bs0 → Ds−ℓ+νX) = 0.82 ± 0.09 (stat) −0.14+0.13 (syst) %.
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    Chat Paper
    【要点】：通过ALEPH探测器在LEP收集的Z衰变数据，本文测定了B-s(0)介子的寿命和产生率，发现了其半轻子衰变模式的新证据。
    

    【方法】：文章采用7种不同的D-s(-)衰变模式与反符号轻子结合，作为B-s(0)介子半轻子衰变的证据。
    

    【实验】：利用1991至1994年间ALEPH探测器在LEP收集的大约300万强子Z衰变事例，通过精心设计的选取准则对208个D(s)(-)l(+)候选事件进行分析，得到了B-s(0)介子的寿命为tau(B-s(0)) = 1.59(-0.15)(+0.17) (stat) +/-0.03 (syst) ps，并测量了相应的产生率分支比为Br((b) over bar --> B-s(0)) . Br(B-s(0) --> D(s)(-)l(+)nu X) = 0.82 +/- 0.09 (stat)(-0.14)(+0.13) (syst) %。
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